所谓生态需水是指为了维持流域生态系统的良性循环，人们在开发流域水资源时必须为生态系统的发展与平衡保证其所需的水量。生态需水是与流域工业、农业、城市生活需水相并列的一个用水单元。生态需水概念的提出体现了一种新的流域环境管理的思维模式，它重视生态环境和水资源之间的内在关系，强调水资源、生态系统和人类社会的相互协调，放弃了传统的以人类需求为中心的流域管理观念。 传统的流域环境管理在水资源分配方案中常常将水资源使用权优先赋予了农业、居民生活和工业，而生态用水通常被忽略或被排挤。
It is shown that the most important parts of ecological water demand include the water sustaining the producers’ normal activities in life and the water for adapting the abiotic environment.
结果表明,生态需水计算的关键是要核算维持生产者的正常生命活动和非生物环境分别向外界释放的水量,不同类型的生态系统对核算的侧重点也不相同。
参考来源 - 我国生态需水研究体系及关键研究命题初探Comparison of the ratio of ecological used water and ecological water requirement also provided a research method of evaluating the river basin’s sustainable development.
以七大流域为例，借鉴蒙大纳法，建立了河流生态需水比例的评价指标体系。
参考来源 - 河流生态环境需水理论方法及应用研究Secondly, the resources dilution-ratio can more fully reflect the extent of river pollution, better evaluate the environmental water requirements.
第二,资源污径比更能全面反映河流污染程度,更好地评价河流生态需水。
参考来源 - 河流生态和环境需水理论与实践Thirdly, based on the ecosystem health evaluation, this study figured out relationship between water level and TSI, and then, developed the environmental flows and levels for Xinglin Bay.
再次，在杏林湾生态系统健康评价的基础上，通过水文过程与生态系统健康之间的响应关系分析，按照生态需水确定原则，研究确定了杏林湾生态需水。
参考来源 - 基于生态系统健康的湖泊生态需水研究Ecological water demand in river channel is figured out definitely, and the ecological water is top-priority in order to suppress the damage to environment in the process of developing suface water.
明确地计算出河道内生态需水量,在开发利用地表水时,生态用水得到优先保证,有效地遏止了水资源开发利用对生态环境的破坏。
参考来源 - 区域水资源评价及优化配置研究Secondly, the resources dilution-ratio can more fully reflect the extent of river pollution, better evaluate the environmental water requirements.
第二,资源污径比更能全面反映河流污染程度,更好地评价河流生态需水。
参考来源 - 河流生态和环境需水理论与实践Eco-environmental water demand is the intrinsic character of ecosystem, and eco-environmental water use is raised from the point of view of water resources allocation.
生态需水是生态系统所固有的特征值,生态用水则是从水资源配置角度提出的概念。
参考来源 - 河流生态需水及生态健康评价研究·2,447,543篇论文数据，部分数据来源于NoteExpress
对生态环境需水进行了分类；
生态环境需水量是当前水资源管理等学科研究的重点和难点。
Study on the ecology water requirement is the emphasis and difficulty for current water resources management.
同时，对生态环境需水量理论进行研究，提出合理、实用的生态环境需水量计算方法。
At the same time, the theory about ecological environment water demands was studied and rational and practical methods on calculating the ecological environment water demands were put forward.
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